San Francisco 49ers Preview: Is Frank Gore’s Career Now in Jeopardy?

Over the past decade, the NFL has transformed from a one-back league to a system where every team really needs to have two good running backs.

It’s no longer feasible for a team to rely on one guy to carry the load in the backfield. The wear and tear that mounts on a player is evident, as many players have come and gone in the blink of an eye.

Just saying the names Terrell Davis, Larry Johnson, Edgerrin James and Shaun Alexander bring back some great memories, but honestly, not that many of them. Those guys were dominant for a few years in the NFL, but they quickly broke down and fell off the map.

Even though the NFL is more of a passing league n...

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